Dr. William A. Carter Chairman and CEO Hemispherx Biopharma, Inc. JFK Boulevard Suite 660 Philadelphia, Pa 19103 Re: Agreement Between Armada Health Care, LLC and Hemispherx Biopharma, Inc. Dear Dr. Carter,

ARMADA

Health Care

July 19, 2013

Xx. Xxxxxxx X. Xxxxxx Chairman and CEO

Hemispherx Biopharma, Inc. JFK Boulevard

Suite 660

Philadelphia, Pa 19103

Re: Agreement Between Armada Health Care, LLC and Hemispherx Biopharma, Inc.

Dear Xx. Xxxxxx,

Armada Health Care would like to request an extension to the above mentioned contract through August 14, 2014 subject to the same terms and conditions currently in place.

Please sign this acceptance letter as acknowledgment of the extension and return to my attention via fax or e-mail. I can be reached at 000-000-0000 if you have any questions

or concerns.

Regards,

Xxxx Xxxxxxx

Vice President

Armada Health Care

Phone: 000-000-0000

Fax: 000-000-0000

/S/: Xxxxxxx X. Xxxxxx

(signature)

Xxxxxxx X. Xxxxxxx

(print name)

CEO and Chairman

(Title)

7/23/2013

(Date)